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Development and Implementation of IEC 61131-3 Virtual Machine

Bartosz Trybus

Theoretical and Applied Informatics | 2011 | vol. 23 | No 1

Keywords multi-platform virtual machine assembler IEC 61131-3 programmable controllers

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Abstract

Virtual machine described in the paper is a runtime program for controllers in small distributed systems. The machine executes intermediate universal code similar to an assembler, compiled in CPDev engineering environment from source programs written in control languages of IEC 61131-3 standard. The machine is implemented as a C program, so it can run on different target platforms. Data formats and commands of the machine code are presented, together with the machine’s Petri-net model, C implementation involving universal and platform-dependent modules, target hardware interface, input/output programming mechanisms, and practical applications.

Authors and Affiliations

Bartosz Trybus

Review of LTCC Technology for Millimeter Waves and Photonics

Markku Lahti Kari Kautio Mikko Karppinen Kimmo Keränen Jyrki Ollila Pentti Karioja

International Journal of Electronics and Telecommunications | 2020 | vol. 66 | No 2 | 361-367 | DOI: 10.24425/ijet.2020.131886

Keywords LTCC millimeter waves photonics assembly

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Abstract

VTT Technical Research Centre of Finland Ltd. has developed and utilized Low Temperature Co-fired Ceramic (LTCC) technology for about 25 years. This paper presents our activities related to photonics and millimetre-waves, including also a relevant literature survey. First a short summary of the technology is given. Especially, the unique features of LTCC technology are described in more details. In addition, several examples have been given to show the validity of LTCC technology in these high-performance fields.

Authors and Affiliations

Markku Lahti

Kari Kautio

Mikko Karppinen

Kimmo Keränen

Jyrki Ollila

Pentti Karioja

Synthesis of Silica Microspheres Containing Iron Oxide Nanoparticles for Removal of Organic Pollutant by Adsorption and Photocatalytic Decomposition

Young-Sang Cho Sohyeon Sung

Archives of Metallurgy and Materials | 2021 | vol. 66 | No 3 | 771-776 | DOI: 10.24425/amm.2021.136378

Keywords Composite Microsphere magnetic nanoparticles Self-assembly adsorption

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Abstract

Iron oxide nanoparticles were incorporated to form composite microspheres of SiO2 and Fe2O3 for magnetic separation of the particles after adsorption or photochemical decomposition. Economic material, sodium silicate, was purified by ion exchange to prepare aqueous silicic acid solution, followed by mixing with iron oxide nanoparticles. Resulting aqueous dispersion was emulsified, and composite microspheres of SiO2 and Fe2O3 was formed from the emulsion droplets as micro-reactors during heating. Removal of methylene blue using the composite microspheres was performed by batch adsorption process. Synthesis of composite microspheres of silica containing Fe2O3 and TiO2 nanoparticles was also possible, the particles could be separated using magnets efficiently after removal of organic dye.

Bibliography

[1] L. Zou, Y. Luo, M. Hooper, E. Hu, Chem. Eng. Process. 45 (11), 959-964 (2006).
[2] F.H. Hussein, T.A. Abass, Int. J. Chem. Sci. 8 (3), 1409-1420 (2010).
[3] H .P. Shivaraju, Int. J. Env. Sci. 1 (5), 911-923 (2011).
[4] A.M. Youssef, A.I. Ahmed, M.I. Amin, U.A. El-Banna, Desalin. Water Treat. 54 (6), 1694-1707 (2015).
[5] E . Colombo, M. Ashokkumar, RSC Adv. 7, 48222-48229 (2017).
[6] M. Schneider, T. Ballweg, L. Groß, C. Gellermann, A. Sanchez‐ Sanchez, V. Fierro, A. Celzard, K. Mandel, Part. Part. Syst. Charact. 36 (6) 1800537-, (2019).
[7] M. Farahmandjou, F. Soflaee, Phys. Chem. Res. 3 (3), 193-198 (2015).

Authors and Affiliations

Young-Sang Cho

1

e-mail:

ORCID:

Sohyeon Sung

1

e-mail:

ORCID:

Korea Polytechnic University, Department of Chemical Engineering and Biotechnology, 237 Sangidaehak-ro, Siheung-si, Gyeonggi 15073, Korea

Crane Selection Problem in Assembly Works Planning – Criteria Relevance and Methods

Roman Marcinkowski Maciej Banach

Archives of Civil Engineering | Vol. 66 | No 3 | 377-390 | DOI: 10.24425/ace.2020.134403

Keywords assembly assembly planning construction cranes MCDA (Multi-Criteria Decision Analysis) relevance of criteria

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Abstract

Crane selection is an important issue in assembly works planning. Tower and telescopic, stationary and mobile cranes used in construction have essentially different properties. Assembly planning begins in analyzing the possibilities of assembly with a given crane. This is called technical aspect of crane selection. Cranes that meet the technical criteria are then analyzed in terms of other criteria related to the effectiveness of their use on the construction site. The article presents the assessment of the selection criteria and the method of crane selection itself. Surveys conducted among construction managers and planners in Polish companies dealing with assembly works allowed to determine the significance of the selection criteria. For this purpose, an example using SAW (Simple Additive Weighting) and FSAW (Fuzzy Simple Additive Weighting) methods was presented. They also allowed to propose a technique for determining preferences in the use of selected construction cranes. The aim of the research was to increase the usability of computer applications supporting assembly planning by acquiring expert knowledge for the initial selection of organizational solutions.

Authors and Affiliations

Roman Marcinkowski

e-mail:

ORCID:

Maciej Banach

e-mail:

ORCID:

Analytical Research on Operational Issues of the Remanufacturing Process in India

Ajay Kumar Sinha Hanumantha Rao P.

Management and Production Engineering Review | 2023 | vol. 14 | No 4 | DOI: 10.24425/mper.2023.147200

Keywords Remanufacturing barriers Operational management production planning Assembly anddisassembly

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Abstract

Environmental awareness among the masses compelled many companies to adopt sustainable practices in their business operations. Remanufacturing is a well-tested and successful business model practiced in many European countries. But in many African and Asian countries, it is still nascent, including India. This research study tries to identify the critical factors in the “Operational Management” area for the viability of remanufacturing business in India. For this purpose, a questionnaire was developed based on the important factors identified from the extensive literature review. An online questionnaire survey was conducted among Indian white goods appliance manufacturing companies and their suppliers. The responses were analyzed statistically and ranked based on their criticality in initiating remanufacturing business in India. The findings may help the Indian government and manufacturing firms to frame proper strategies related to the operational management issues of remanufacturing business in India.

Authors and Affiliations

Ajay Kumar Sinha

Hanumantha Rao P.

Decentralized Scheduling and Dispatch Control for the Traditional Labor-Intensive Assembly System

Sri RAHARNO Vina Sari YOSEPHINE Rachmad HARTONO Ari SETIAWAN

Management and Production Engineering Review | 2024 | DOI: 10.24425/mper.2024.149986

Keywords decentralized Scheduling control Assembly Labor-Intensive Intelligent ManufacturingSystems

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Abstract

The fourth industrial revolution has broadly transformed the manufacturing system. However, this transformation is somewhat lacking in traditional or manual production systems due to the absence of IT infrastructure. Such traditional industries need to have the advantage of real-time control and monitoring. This study has developed economic assembly planning, scheduling, and control for a traditional assembly system. We used the concept of the configurable virtual workstation as the digitalization framework. Then, we employed the decentralized scheduling concept to reduce the computational effort in scheduling the complex product. The implementation result showed that scheduling and planning have transformed the traditional assembly process into intelligent scheduling and control with low digitalization effort

Authors and Affiliations

Sri RAHARNO

Vina Sari YOSEPHINE

Rachmad HARTONO

Ari SETIAWAN

Computer-Aided Selection of the Stabilising System Parameters of the Mobile Transport and Assembly Manipulator in Mining Excavations

Krzysztof Krauze Ryszard Klempka Kamil Mucha Tomasz Wydro

Archives of Mining Sciences | 2023 | vol. 68 | No 1 | 3-18 | DOI: 10.24425/ams.2023.144314

Keywords underground mining transport and assembly manipulator physical model mathematical model stability simulation tests

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Abstract

Shifting masses in a confined space in the company of other machines and devices, which limits the manoeuvring and transport area, poses a significant problem in every field of industry, especially with underground mining. The works involved in transporting and manoeuvring masses in underground workings are challenging and are most often performed using various auxiliary machines or manually. Hence the need arose to develop a device carrying out activities related to the shifting of masses with the assumed maximum value. The device was created as a result of cooperation between FAMA sp. z o.o. and the AGH University of Science and Technology in Kraków, Poland. The mining modular transport and assembly unit (MZT-M) enables assembling and transporting various masses, especially the elements of the roadway support in the face. The primary function of this device is its movement in the excavation along with the transported mass and delivering it to a specific place. Therefore, an important issue is to ensure the module’s stability in different phases of its operation (lifting, transport, manoeuvring, feeding, lowering) due to the limited space in the excavation. That is why an analytical model and specialised software were created to determine the design parameters of the device as a function of its operating phases, especially the counterweight’s mass. As previously mentioned, an analytical model (physical, mathematical) with equations and applications written in Microsoft Visual Studio and Matlab was used for this purpose. It is beneficial at the design or construction changes stage. Calculation results are documented in the form of numerical summaries and graphs.

Authors and Affiliations

Krzysztof Krauze

1

e-mail:

ORCID:

Ryszard Klempka

1

e-mail:

ORCID:

Kamil Mucha

1

e-mail:

ORCID:

Tomasz Wydro

1

e-mail:

ORCID:

AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland

Conceptual Model Creation for Automated Self-training System of Functional Control and Detection of Railway Transport

Ayaulym Oralbekova Marzhana Amanova Kamila Rustambekova Zhanat Kaskatayev Olga Kisselyova Roza Nurgaliyeva

International Journal of Electronics and Telecommunications | 2021 | vol. 67 | No 4 | 603-608 | DOI: 10.24425/ijet.2021.137852

Keywords railway transport a system of components and assemblies decision support systems intelligent technology automatic detection systems an object used for training

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Abstract

In order to improve the operational reliability and service life of the main systems, components and assemblies (SCA) of railway transport (RT), it is necessary to timely detect (diagnose) their defects, including the use of the methods of intellectual analysis and data processing.
One of the promising approaches to the synthesis of the SCA functional control system is the use of intelligent technology (INTECH) methods. This technology is based on maximizing the information capacity of an automated decision support system for detecting faults during its training.

Bibliography

[1] M. Schickert, I. Aydin, M. Karak¨ose, E. & Akin, ”A new contactless fault diagnosis approach for pantograph-catenary system,” in MECHATRONIKA, 2012 15th International Symposium, pp. 1-6, IEEE, 2012.
[2] A. Le Mortellec, J. Clarhaut, Y. Sallez, D. Berger, & Trentesaux, ”Embedded holonic fault diagnosis of complex transportation systems,” Engineering Applications of Artificial Intelligence, 26(1), pp. 227-24, 2013.
[3] Ph M. Papaelias, C. Roberts, L.C. & Davis, ”A review on non-destructive evaluation of rails: state-of-the-art and future development,” Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 222(4), pp. 367-384, 2008.
[4] J. Seeliger, Mackel, D. Georges, ”Measurement and diagnosis of process-disturbing oscillations in high-speed rolling plants,” in Proc. XIV IMEKO World Congress, 2002.
[5] X.S. Jin, J. Guo, X.B. Xiao, Z.F. Wen, & Z.R. Zhou, ”Key scientific problems in the study on running safety of high speed trains,” Engineering Mechanics, 26 (Sup II), pp. 8–25, 2009.
[6] L. Mariani, F. Pastore, & M. Pezze, ”Dynamic analysis for diagnosing integration faults,” IEEE Transactions on Software Engineering, 37(4), pp. 486-508, 2011.
[7] Y.C. Huang, H.C. Sun, ”Dissolved gas analysis of mineral oil for power transformer fault diagnosis using fuzzy logic,” IEEE Transactions on Dielectrics and Electrical Insulation, 20(3), pp. 974-981, 2013.
[8] Orb´an, Zolt´an, and Marc Gutermann, ”Assessment of masonry arch railway bridges using non-destructive in-situ testing methods,” Engineering Structures, 31.10 (2009): pp. 2287-2298, 2009.
[9] Yella, Siril, M. S. Dougherty, and N. K. Gupta, ”Artificial intelligence techniques for the automatic interpretation of data from non-destructive testing,” Insight-Non-Destructive Testing and Condition Monitoring, 48.1: pp. 10-20, 2006.
[10] P.S. Bhowmik, S. Pradhan, M. Prakash, ”Fault diagnostic and monitoring methods of inductionmotor: a review,” International Journal of Applied Control, Electrical and Electronics, Vol. 1, pp. 1-18, 2013.
[11] Petr Dolezel, Pavel Skrabanek, Lumir Gago, ”Pattern recognition neural network as a tool for pest birds detection,” Computational Intelligence, SSCIIEEE Symposium Series on, pp. 1-6, 2016.
[12] V. Lakhno, Y. Tkach, T. Petrenko, S. Zaitsev, & V. Bazylevych, V. ”Development of adaptive expert system of information security using a procedure of clustering the attributes of anomalies and cyber attacks,” Eastern-European Journal of Enterprise Technologies, (6 (9)), pp. 32- 44, 2016.
[13] V. Lakhno, ”Creation of the adaptive cyber threat detection system on the basis of fuzzy feature clustering,” Eastern-European Journal of Enterprise Technologies, 2.9 2016:18, 2016.
[14] V.A. Lakhno, P.U. Kravchuk, V.P. Malyukov, V.N. Domrachev, L.V. Myrutenko, O.S. Piven, ”Developing of the cyber security system based on clustering and formation of control deviation signs,” Journal of Theoretical and Applied Information Technology, Vol. 95, Iss. 21, pp. 5778-5786.
[15] A.S. Dovbish, ”Osnovi proektuvannja ntelektualnih sistem” / A.S. Dovbish. Sumi: SumDU, 171 p., 2009.
[16] X. Zhang, N. Feng, Y. Wang, & Y. Shen, ”Acoustic emission detection of rail defect based on wavelet transform and Shannon entropy,” Journal of Sound and Vibration, p. 419-432, 2015.
[17] A. Giantomassi, F. Ferracuti, S. Iarlori, G. Ippoliti, & S. Longhi, ”Electric motor fault detection and diagnosis by kernel density estimation and Kullback–Leibler divergence based on stator current measurements,” IEEE Transactions on Industrial Electronics, 2015, 62(3), pp. 1770- 1780, 2015.

Authors and Affiliations

Ayaulym Oralbekova

1

Marzhana Amanova

1

Kamila Rustambekova

1

Zhanat Kaskatayev

1

Olga Kisselyova

2

Roza Nurgaliyeva

1

Kazakh University Ways of Communications, Almaty, Kazakhstan
Kazakh Academy of Transport and Communications named after M. Tynyshpayev, Almaty, Kazakhstan

Numerical investigation of rotor-bearing systems with fractional derivative material damping models

Gregor Überwimmer Georg Quinz Michael Klanner Katrin Ellermann

Bulletin of the Polish Academy of Sciences Technical Sciences | 2023 | 71 | 6 | e148610 | DOI: 10.24425/bpasts.2023.148610

Keywords Numerical Assembly Technique rotor-bearing system steady-state harmonic vibration unbalance response fractional derivative damping model

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Abstract

The increasing demand for high-speed rotor-bearing systems results in the application of complex materials, which allow for a better control of the vibrational characteristics. This paper presents a model of a rotor including viscoelastic materials and valid up to high spin speeds. Regarding the destabilization of rotor-bearing systems, two main effects have to be investigated, which are strongly related to the associated internal and external damping of the rotor. For this reason, the internal material damping is modeled using fractional time derivatives, which can represent a large class of viscoelastic materials over a wide frequency range. In this paper, the Numerical Assembly Technique (NAT) is extended for the rotating viscoelastic Timoshenko beam with fractional derivative damping. An efficient and accurate simulation of the proposed rotor-bearing model is achieved. Several numerical examples are presented and the influence of internal damping on the rotor-bearing system is investigated and compared to classical damping models.

Authors and Affiliations

Gregor Überwimmer

1

e-mail:

ORCID:

Georg Quinz

1

Michael Klanner

1

e-mail:

ORCID:

Katrin Ellermann

1

Graz University of Technology, Institute of Mechanics, Kopernikusgasse 24/IV, 8010 Graz, Austria

Balancing of a linear elastic rotor-bearing system with arbitrarily distributed unbalance using the Numerical Assembly Technique

Georg Quinz Marcel S. Prem Michael Klanner Katrin Ellermann

Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 6 | e138237 | DOI: 10.24425/bpasts.2021.138237

Keywords Numerical Assembly Technique rotor dynamics modal balancing recursive eigenvalue search algorithm

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Abstract

In this paper, a new application of the Numerical Assembly Technique is presented for the balancing of linear elastic rotor-bearing systems with a stepped shaft and arbitrarily distributed mass unbalance. The method improves existing balancing techniques by combining the advantages of modal balancing with the fast calculation of an efficient numerical method. The rotating stepped circular shaft is modelled according to the Rayleigh beam theory. The Numerical Assembly Technique is used to calculate the steady-state harmonic response, eigenvalues and the associated mode shapes of the rotor. The displacements of a simulation are compared to measured displacements of the rotor-bearing system to calculate the generalized unbalance for each eigenvalue. The generalized unbalances are modified according to modal theory to calculate orthogonal correction masses. In this manner, a rotor-bearing system is balanced using a single measurement of the displacement at one position on the rotor for every critical speed. Three numerical examples are used to show the accuracy and the balancing success of the proposed method.

Bibliography

J. Tessarzik, Flexible rotor balancing by the exact point speed influence coefficient method. Latham: Mechanical Technology Incorporated, 1972.
P. Gnielka, “Modal balancing of flexible rotors without test runs: An experimental investigation,” Journal of Vibrations, vol. 90, no. 2, pp. 152–170, 1982.
K. Federn, “Grundlagen einer systematischen Schwingungsentstörung wellenelastischer Rotoren,” VDI Bericht, vol. 24, pp. 9‒25, 1957.
A. G. Parkinson and R. E. D. Bishop, “Residual vibration in modal balancing,” Journal of Mechanical Engineering Science, vol. 7, pp. 33–39, 1965.
W. Kellenberger, “Das Wuchten elastischer Rotoren auf zwei allgemeinelastischen Lagern,” Brown Boveri Mitteilungen, vol. 54, pp. 603– 617, 1967.
A.-C. Lee, Y.-P. Shih, and Y. Kang, “The analysis of linear rotor bearing systems: A general Transfer Matrix Method,” Journal of Vibration and Accoustics, vol. 115, no. 4, pp. 490–497, 1993.
J.-S. Wu and H. M. Chou, “A new approach for determining the natural frequency of mode shapes of a uniform beam carrying any number of sprung masses,” Journal of Sound and Vibration, vol. 220, no. 3, pp. 451–468, 1999.
J.-S. Wu, F.-T. Lin, and H.-J. Shaw, “Analytical solution for whirling speeds and mode shapes of a distributed-mass shaft with arbitrary rigid disks,” Journal of Applied Mechanics, vol. 81, no. 3, pp. 034 503–1–034 503–10, 2014.
M. Klanner, M.S. Prem, and K. Ellermann, “Steady-state harmonic vibrations of a linear rotor- bearing system with a discontinuous shaft and arbitrarily distributed mass unbalance,” in Proceedings of ISMA2020 International Conference on Noise and Vibration Engineering and USD2020 International Conference on Uncertainty in Structural Dynamics, 2020, pp. 1257–1272.
M. Klanner and K. Ellermann, “Steady-state linear harmonic vibrations of multiple-stepped Euler-Bernoulli beams under arbitrarily distributed loads carrying any number of concentrated elements,” Applied and Computational Mechanics, vol. 14, no. 1, pp. 31–50, 2019.
M.B. Deepthikumar, A.S. Sekhar, and M.R. Srikanthan, “Modal balancing of flexible rotors with bow and distributed unbalance,” Journal of Sound and Vibration, vol. 332, pp. 6216‒6233, 2013.
O.A. Bauchau and J.I. Craig, Structural Analysis – With Applications to Aerospace Structures. Heidelberg: Springer Verlag, 2009.
R.E.D. Bishop and A.G. Parkinson, “On the isolation of modes in balancing of flexible shafts,” Proc. Inst. Mech. Eng., vol. 117, pp. 407– 426, 1963.
X. Rui, G. Wang, Y. Lu, and L. Yunm, “Transfer Matrix Method for linear multibody systems,” Multibody Syst. Dyn., vol. 19, pp. 179–207, 2008.
I.N. Bronstein, K.A. Semendjajew, and E. Zeidler, Taschenbuch der Mathematik. Stuttgard: Teubner, 1996.
D. Bestle, L. Abbas, and X. Rui, “Recursive eigenvalue search algorithm for transfer matrix method of linear flexible multibody systems,” Multibody Syst. Dyn., vol. 32, pp. 429–444, 2013.
B. Xu and L. Qu, “A new practical modal method for rotor balancing,” Proc. Inst. Mech. Eng. Part C J. Mech. Eng. Sci., vol. 215, pp. 179–190, 2001.
J. Tessarzik, Flexible rotor balancing by the influence coefficient method. Part 1: Evaluation of the exact point speed and least squares procedure. Latham: Mechanical Technology Incorporated, 1972.

Authors and Affiliations

Georg Quinz

1

Marcel S. Prem

1

Michael Klanner

1

e-mail:

ORCID:

Katrin Ellermann

1

Graz University of Technology, Institute of Mechanics, Kopernikusgasse 24/IV, 8010 Graz, Austria

Quasi-analytical solutions for the whirling motion of multi-stepped rotors with arbitrarily distributed mass unbalance running in anisotropic linear bearings

Michael Klanner Marcel S. Prem Katrin Ellermann

Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 6 | e138999 | DOI: 10.24425/bpasts.2021.138999

Keywords Numerical Assembly Technique rotor dynamics whirling motion unbalance response quasi-analytical solution

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Abstract

Vibration in rotating machinery leads to a series of undesired effects, e.g. noise, reduced service life or even machine failure. Even though there are many sources of vibrations in a rotating machine, the most common one is mass unbalance. Therefore, a detailed knowledge of the system behavior due to mass unbalance is crucial in the design phase of a rotor-bearing system. The modelling of the rotor and mass unbalance as a lumped system is a widely used approach to calculate the whirling motion of a rotor-bearing system. A more accurate representation of the real system can be found by a continuous model, especially if the mass unbalance is not constant and arbitrarily oriented in space. Therefore, a quasi-analytical method called Numerical Assembly Technique is extended in this paper, which allows for an efficient and accurate simulation of the unbalance response of a rotor-bearing system. The rotor shaft is modelled by the Rayleigh beam theory including rotatory inertia and gyroscopic effects. Rigid discs can be mounted onto the rotor and the bearings are modeled by linear translational/rotational springs/dampers, including cross-coupling effects. The effect of a constant axial force or torque on the system response is also examined in the simulation.

Bibliography

J.W. Lund and F.K. Orcutt, “Calculations and Experiments on the Unbalance Response of a Flexible Rotor,” J. Eng. Ind., vol. 89, no. 4, pp. 785–796, 1967.
A. Vollan and L. Komzsik, Computational Techniques of Rotor Dynamics with the Finite Element Method. Boca Raton: CRC Press, 2012.
J.S. Rao, Rotor Dynamics. New Delhi: New Age International, 1996.
A.-C. Lee and Y.-P. Shih, “The Analysis of Linear Rotor-Bearing Systems: A General Transfer Matrix Method,” J. Vib. Acoust., vol. 115, no. 4, pp. 490–497, 1993.
T. Yang and C. Lin, “Estimation of Distributed Unbalance of Rotors,” J. Eng. Gas Turbines Power, vol. 124, no. 4, pp. 976‒983, 2002.
J.-S. Wu and H.-M. Chou, “A new approach for determining the natural frequencies and mode shapes of a uniform beam carrying any number of sprung masses,” J. Sound Vib., vol. 81, no. 3, pp. 1–10, 1999.
J.-S. Wu, F.-T. Lin, and H.-J. Shaw, “Analytical Solution for Whirling Speeds and Mode Shapes of a Distributed-Mass Shaft With Arbitrary Rigid Disks,” J. Appl. Mech., vol. 220, no. 3, pp. 451–468, 2014.
M. Klanner and K. Ellermann, “Steady-state linear harmonic vibrations of multiple-stepped Euler-Bernoulli beams under arbitrarily distributed loads carrying any number of concentrated elements,” Appl. Comput. Mech., vol. 14, no. 1, pp. 31–50, 2020.
M. Klanner, M.S. Prem, and K. Ellermann, “Steady-state harmonic vibrations of a linear rotor-bearing system with a discontinuous shaft and arbitrary distributed mass unbalance,” in Proceedings of ISMA2020 International Conference on Noise and Vibration Engineering and USD2020 International Conference on Uncertainty in Structural Dynamics, Leuven, Belgium, Sep. 2020, pp. 1257–1272.
H. Ziegler, “Knickung gerader Stäbe unter Torsion,” J. Appl. Math. Phys. (ZAMP), vol. 3, pp. 96–119, 1952.
V.V. Bolotin, Nonconservative Problems of the Theory of Elastic Stability. New York: Pergamon Press, 1963.
H. Ziegler, Principles of Structural Stability. Basel: Springer Basel AG, 1977.
L. Debnath and D. Bhatta, Integral Transforms and Their Applications. CRC Press, 2015.
D. Mitrinović and J.D. Kečkić, The Cauchy Method of Residues. D. Reidel Publishing, 1984.
S.I. Hayek, Advanced Mathematical Methods in Science and Engineering. CRC Press, 2010.
B. Adcock, D. Huybrechs, and J. Martín-Vaquero, “On the Numerical Stability of Fourier Extensions,” Found. Comput. Math., vol. 14, no. 4, pp. 638–687, 2014.
R. Matthysen and D. Huybrechs, “Fast Algorithms for the Computation of Fourier Extensions of Arbitrary Length,” SIAM J. Sci. Comput., vol. 38, no. 2, pp. A899–A922, 2016.
A.-C. Lee, Y. Kang, and L. Shin-Li, “A Modified Transfer Matrix Method for Linear Rotor-Bearing Systems,” J. Appl. Mech., vol. 58, no. 3, pp. 776–783, 1991.
M.I. Friswell, J.E. T. Penny, S.D. Garvey, and A.W. Lees, Dynamics of Rotating Machines. New York: Cambridge University Press, 2010.
A. De Felice and S. Sorrentino, “On the dynamic behaviour of rotating shaftsunder combined axial and torsional loads,” Meccanica, vol. 54, no. 7, pp. 1029–1055, 2019.
R.L. Eshleman and R.A. Eubanks, “On the Critical Speeds of a Continuous Rotor,” J. Manuf. Sci. Eng., vol. 91, no. 4, pp. 1180‒1188, 1969.

Authors and Affiliations

Michael Klanner

1

e-mail:

ORCID:

Marcel S. Prem

1

Katrin Ellermann

1

Graz University of Technology, Institute of Mechanics, Kopernikusgasse 24/IV, 8010 Graz, Austria

Reducing Flow Time in an Automotive Asynchronous Assembly Line – An application from an automotive factory

Salah Eddine Ayoub El Ahmadi Laila El Abbadi

Management and Production Engineering Review | 2022 | vol. 13 | No 1 | 99-106 | DOI: 10.24425/mper.2022.140880

Keywords Automotive industry flow time asynchronous assembly line buffer time buffer profiles

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Abstract

The automotive industry is a highly competitive sector. Manufacturers must effectively control highly complex production processes in order to fulfil all customer orders for customized cars on time, on budget and to the required quality. In this paper, the authors focus on improving the flow time of asynchronous automotive assembly lines by reducing the buffer time. A simulation-search heuristic procedure was developed and confirmed in a 5 workstations asynchronous assembly line installed in an automotive company. The proposed procedure identifies optimal performing buffer profiles for each storage level which guarantees lowest flow time while keeping the same throughput level. Experiments results show that our new algorithm significantly outperforms existing results, especially for large scale problems.

Authors and Affiliations

Salah Eddine Ayoub El Ahmadi

1

Laila El Abbadi

1

Engineering Sciences Laboratory, National School of Applied Sciences, Ibn Tofail University, Kenitra, Morocco

Seru Production System: A Review and Projections for Future Research

Yung Chin Shih

Management and Production Engineering Review | 2021 | vol. 12 | No 4 | DOI: 10.24425/mper.2021.139995

Keywords Seru production systems Flexible and reconfigurable manufacturing systems Production activity control Assembly and disassembly Manufacturing plant control

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Abstract

In mid-1992, Japanese consultant Yamada Hitoshi was tasked with modifying the production systems of Japanese companies as the existing configurations at manufacturing plants no longer satisfied unstable demands. He made improvements to the overall production system by dividing the long assembly lines into several short ones called cells or seru. Although of the advantages, it is still unclear about how to manage this new production system, and what variables really promoted the desired benefits. We identify in total 39 articles from 2004– 2020 about the progress of the seru production system, and we observe some possibilities to improve the effectiveness of this type of the production system. The first is the possibility of manufacturing the product in flexible sequence, in which the operations are independent among them. We show through the developed example that the makespan may be different. We noted when converting the in-line production system to one pure seru, the makespan tend to increase. Nevertheless, when analyzing the effectiveness of serus working concomitantly considering splitting the same lot, makespan and the cost may be reduced. And finally, when converting to one of pure serus, the performance may be similar to that obtained when serus working concomitantly.

Authors and Affiliations

Yung Chin Shih

The solution of MRSLP with the use of heuristic algorithms

Joanna Kochańska Anna Burduk Dagmara Łapczyńska Kamil Musiał

Bulletin of the Polish Academy of Sciences Technical Sciences | 2024 | 72 | 1 | e146407 | DOI: 10.24425/bpasts.2023.146407

Keywords in-plant logistics milk run heuristic algorithms assembly line genetic algorithm tabu Search simulated annealing

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Abstract

Improving production processes includes not only activities concerning manufacturing itself, but also all the activities that are necessary to achieve the main objectives. One such activity is transport, which, although a source of waste in terms of adding value to the product, is essential to the realization of the production process. Over the years, many methods have been developed to help manage supply and transport in such a way as to reduce it to the necessary minimum. In the paper, the problem of delivering components to a production area using trains and appropriately laid-out carriages was described. It is a milk run stop locations problem (MRSLP), whose proposed solution is based on the use of heuristic algorithms. Intelligent solutions are getting more and more popular in the industry because of the possible advantages they offer, especially those that include the possibility of finding an optimum local solution in a relatively short time and the prevention of human errors. In this paper, the applicability of three algorithms – tabu search, genetic algorithm, and simulated annealing – was explored.

Authors and Affiliations

Joanna Kochańska

1

Anna Burduk

1

e-mail: anna.burduk@pwr.edu.pl

ORCID:

Dagmara Łapczyńska

1

Kamil Musiał

1

Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland

'Journalists-turned-parliamen-tarians' in the 1919 Constituent Assembly: An analysis of their presence and participation in parliamentary debate on the basis of the Stenographic Reports of the Legislative Sejm (1919–1922)

Grażyna Wrona

Rocznik Historii Prasy Polskiej | 2023 | t. 26 | No 4 | 61-83 | DOI: 10.24425/rhpp.2023.148238

Keywords Journalism and politics journalists-turned-parliamen-tarians Polish Constituent Assembly (1919–1922)

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Abstract

This article presents a collective portrait of the 231 deputies of the 1919 Constituent Assembly who match the broad label 'journalist politicians'. The basic source for this analysis are the minutes of the proceedings, Stenographic Reports of the Legislative Sejm (1919–1922), as well as various printed materials produced by the assembly, including questions and interpellations, urgent motions, rules of procedure, lists and inventories, etc.

Authors and Affiliations

Grażyna Wrona

1

e-mail:

ORCID:

Instytut Nauk o Informacji, Uniwersytet Komisji Edukacji Narodowej w Krakowie

Design using special steel sheet profiles – procedures developed within the framework of Grispe and Grispe Plus projects

M. Maslak M. Pazdanowski

Archives of Civil Engineering | 2019 | Vol. 65 | No 4 | 249-261

Keywords thin-walled steel sheet profiles amendments and additions to the standards moment resistance susceptibility to deformations profile assemblies embossments and/or indentations holes and/or perforation interlocking planks

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Abstract

New computational procedures developed within the framework of international research projects „Grispe” and „Grispe Plus” are briefly presented and characterised here. Considered algorithms pertain to the verification of bearing capacity and serviceability of selected bearing structure components erected with especially shaped thinwalled sheet metal panels. Structural components of this type are so far rather absent from the codes, and as a result the unequivocal design requirements have not been developed for them. Key problems related to the detailed analysis of the following element classes: steel decks with embossments, indentations and/or outwards stiffeners; liner trays; corrugated sheeting; curved profiles; cladding and roof profile assemblies; perforated and holed profiles; external interlocking planks and their assemblies are indicated in the text. The procedures formulated as a part of the projects indicated above have been delivered to CEN as an official proposal of amendments and/or additions submitted for introduction to the new generation of Eurocodes currently under preparation, and especially as an extension to the code EN 1993-1-3.

Authors and Affiliations

M. Maslak

M. Pazdanowski

Unresolved Issues and Emerging Challenges in the Law of the Sea

Janusz Symonides

Prawo Morskie | 2018 | No XXXIV | 17-39 | DOI: 10.24425/pm.2018.125828

Keywords Third Conference UNCLOS General Assembly IMO territorial sea exclusive economic zone continental shelf marine biological diversity marine genetic resources freedom of navigation underwater cultural heritage equity

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Abstract

The study addresses the challenges facing the law of the sea. Although UNCLOS is rightly described as a constitution of the law of the sea, it does not and cannot give answers to all problems and doubts that arise in practice and that are related to global warming, protection of biodiversity, legal status of genetic resources, controversy concerning shipping, delimitation of areas or the protection of underwater cultural heritage. Hence the question arises, what the ways and means of further development of the law of the sea are. Undoubtedly, one of the possibilities is to develop implementation agreements, of which the third devoted to the protection and sustainable use of marine biodiversity outside national jurisdiction is the subject of an international conference convened by the General Assembly, whose resolutions in the area of the law of the sea play an important role. Undoubtedly, also the importance of the organization of the United Nations system, such as the IMO, FAO, UNESCO, UNEP is significant. There is also the possibility of accepting agreements addressing the issues left by UNCLOS without solution or definition. Not without significance is the soft law and the practice of states as well as the position of the organs appointed by UNCLOS.

Authors and Affiliations

Janusz Symonides

1

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